Which type of fog occurs when warm air is blown over a cool surface?

The correct choice of advection fog is based on the process by which it forms. Advection fog occurs when warm, moist air moves over a cooler surface, such as cool water or land. This temperature difference causes the moisture in the warm air to condense, resulting in fog.

In the case of advection fog, it is the lateral movement of warm air that interacts with a cooler surface, which plays a crucial role in its formation. This distinguishes it from other types of fog. For instance, radiation fog forms under calm conditions at night when the Earth's surface cools rapidly, leading to condensation of moisture close to the ground. Steam fog occurs when cold air moves over warm water, causing water vapor to rise and create fog. Upslope fog develops when moist air is forced to rise over terrain, cooling as it elevates and condensing into fog.

Advection fog is particularly common near coastlines or large bodies of water, where warm air can easily be transported over cooler surfaces, making it a prevalent phenomenon in various weather conditions.